Protected steel structure and method of forming the same



H. HANNA Dec. 11, 1934.

'Filed July 30, 1932 awe/whom Q flarre a az/la 9%., m Mum Patented Dec. 11, 1934 QUNITEDIFSTATES" P ENT OFFICE PROT CTED 1,984,132 a STEEL "STRUCTURE AND METHOD OF FORMING THE, SAME Harvey Hanna, Detroit, Mich. Application July 30, seaiseri l No. 627,009 v 7 Claims. (orig-561) The inventionrelates to the protection ofv steel structures by enclosing the elements thereof in a fire and heat resisting casing. In the present state, of the art one methodwhich' has .been employed for protecting such structures is; by shooting the cementitiousmaterialsin place; through the use of an air gun. This produces a very effective insulation or protective coating but to p'rop erly shape the material it is necessary to use forms or shooting strips partially enclosing the space to be filled. The fitting and installation of such forms or shooting strips adds to the expense.

are used,these are generally unsuitable'for use on another structure.

It is one of the objects of the present invention to avoid the difliculties and expense of erecting 0 temporary forms by substituting therefor elements which constitute a permanent part of the insulating structure. It is a further object to form these elements of the same material used for the insulation or protection so that in the final structure they will be integrated with the gun shot material.

My improvement has many applications but in the accompanying drawing I have shown only one specific structure.

Figure 1 is a sectional perspective view of a metallic beam showing my improved protective casing applied thereto;

Figure 2 is a perspective view of one of the clips used in securing the forms in position and in permanent engagement with the beam.

As shown in Figure 1, A is a steel beam specifically an I-beam which forms a portion of a building structure (not further illustrated). B is the protecting casing for the beam which includes portions B extending upon opposite sides of the web of the beam portions B above the lower flanges of the beam and a portion B beneath the lower flange of the beam. The portions B and B extend sufliciently beyond the outer edges of the flanges to form a thorough protection for the whole beam.

Without the use of a form or shooting strip it would be impossible to shape the portions of the protective casing above described by shooting the material into position. It is not, however, necessary to completely enclose the space to be filled but only to arrange forms or shooting strips in certain positions so as to retain the shot material and permit it to build up around other portions of the structure. Thus as shown, the portions B and B above and below the lower flanges of the beam extend out beyond the edges of such flanges and some retaining form is necessary to hold the shot material to the desired shape.

With my improved method I first cast or otherwise construct slabs or shooting strips of the same material used for the other part-of the protecting casing. One of these shooting stripsC is arranged to limit the outward extent of the material forming the portions B and B on one side of the beam and a similar shooting strip 0' is used upon the opposite side. As these shooting strips are to be incorporated as a permanent part, of the structure, they must be accurately positionedwith respect to the beam and held in such positions until integratedwith the material which is shot by the gun. This I preferably accomplish by the use of metallic clips D which as shown in Figure 2 are formed from sheet metal being provided with a vertically extending stem portion D, a T-head D at the bottom of this stem, a portion D at the upper end of the stem parallel to one end of the head D and an intermediate portion D which is struck out perpendicular to the plane of the other portions. The portion D has its outer end bent to form an eye D for receiving a bolt E passing therethrough. This bolt engages a nut F which bears against the lower end of the eye while the bolt E aligns with the T-head D With the construction of clip just described, it may be secured to the flange A of the beam by placing the T-head beneath said flange and then screwing down the bolt E in the nut F until it clamps against the upper face of said flange. The perpendicular portion D also bears against the edge of the flange A soas to hold the remaining portions of the clip perpendicular to said edge of the flange. A series of clips positioned as above described form a support for the shooting strips 0 and C which latter are molded with a shoulder C which rests upon the upper edge of the outwardly extending portion of the T-head D With the structure as just described, the balance of the protective casing can be formed by shooting the material in with a gun, first filling against the inner face of the slab C until the space between the same and the edge of the flange A is closed in. It then becomes feasible to fill in the space forming the portion B by directing the gun upward against the lower flange of the beam and to fill in the space forming the portions B and B by.shooting material in from the side of the beam and above the flange A.

The members C and C may be constructed either by casting the plastic material in suitable molds, or the material may be shot by the use of the gun into a mold to give it the desired shape. The material which is shot against these members C and C will integrate therewith so that in the complete structure the casing is all of one material.

What I claim as my invention is:

l. The method of protecting metallic structures which consists in pre-molding a cement shooting strip, mounting said shooting strip in spaced relation to the metallic member to be protected and to constitute a portion of the outer surface of the protection and shooting cementitious material around the unenclosed portions of said metallic member and between the same and said shooting strip to complete the protection.

2. The method of protecting metallic structures which consists in pre-molding a cement shooting strip, engaging clips with the metallic member, mounting said shooting strip thereupon in spaced relation to said member and shooting cementitious material around the unenclosed portions of said metallic member and between the same and said shooting strip to complete the protection.

3. The method of protecting flanged metallic members which consists in pre-molding a cement shooting strip, engaging clips with said flange, supporting said shooting strip upon said clips in spaced relation to the edge of said flange and in shooting cementitious material around the unenclosed portions of said flange and in between the same and said shooting strip to complete the protection.

4. A protection for metallic structures comprising a cement shooting strip, clips for supporting said shooting strip upon said metallic member in spaced relation thereto, and shot in cementitious material filling said space between said shooting strip and metallic member and surrounding the unenclosed portions of latter.

5. A protection for flanged metallic structures comprising clips secured to the flange of said structure, a cement shooting strip supported upon said clips in spaced relation to the edge of said flange, and shot in cementitious material surrounding the unenclosed portions of said flange, filling the space between the same and said shooting strip and imbedding said clips.

6. The combination with a flanged metallic member, of a shooting strip arranged in spaced relation to the edge of said flange, cementitious material surrounding said metallic member and filling the space between the same and said shooting strip, and clips for supporting said shooting strip on said metallic member, each comprising a sheet metal stamping having a U-shaped portion for engaging the flange of the metallic member, a bolt engaging one leg of the U to clamp said clip to said flange, and an outwardly extending shoulder or ledge for supporting said shooting strip.

'7. A protection for flanged metallic members comprising a molded shooting strip, clips for supporting said shooting strip in spaced relation to the flange of said member, each comprising a sheet metal stamping having a U-shaped portion, a struck out flange perpendicular to the plane of the U, an eye formed in one leg 'of the U, a bolt passing through said eye and provided with a nut forming a clamp for securing said clip to said flange, said struck-out perpendicular portion holding said clip perpendicular to the edge of said flange and an outwardly extending ledge or shoulder on said clip for supporting said shooting strip.

HARVEY HANNA. 

